選炭水処理

抄録

The methods that may be applied to the treatment of slurries and water of coal preparation are related to the problems of coal preparation practice, stream pollution, and loss of coal in preparation. The equipments usually employed for that purpose are cone-type drag tanks and thickeners. A thickener is considered to be a continuous settling pond.
The area required of a drag tank or a thickener is the maximum value from the equation A=V₁/ν
where V1 is the volume of feed water per unit time, ν is the corresponding subsidence rate of minimum of solid of the drag tank or the thickener.
The total volume of the consolidation zone is V=t (V ₀ω₀- V₁ω₁)/ω₂
where V₀ is the feed volume per unit time, ω₀ is weight percent of the feed pulp, V₁ is the overflow volume, ω₁ is the weight percent of solids of the overflow. The consolidation tests show the length of time t that pulp must be held in the consolidation zone in order to produce underfloW of a desired weight percent ω₂.